James harris rogers



a (No Model.)

J. H. ROGERS.

MAGNETIG RECEIVER.

No. 257,075. Patented Apr. 25', 1882.

UNITED STATES PATENT OFFICE.

JAMES HARRIS ROGERS, OF WASHINGTON, D. 0., ASSIGNOR. OF ONE-HALF TO FRANK HUME AND L. G. IIINE, BOTH OF SAME PLACE.

MAGNETIC RECEIVER.

SPECIFICATION forming part of Letters Patent No. 257,075, dated April 25, 1882.

Application filed March 6, 1882. (No model.)

To all whom it may concern:

Be it known that I, JAMES HARRIS ROGERS, a citizen of the United States, residing at Washington, in the Districtof Columbia, have invented new and useful Improvements in lllagneto-Receivers, of which the following is aspecification. I

My invention relates to the well-known class ofmagnetotelephoncs;anditconsistsincertaiu 1o improvements which will be fully hereinafter set forth and claimed.

In the accompanying drawings, Figure 1 is a longitudinal section through my improved instrument; and Fig.2, a similar View, showing 1 a slightly-modified construction.

The diaphragm A, which may be of any suitable material, either magnetic or non-mag netic, is secured in the casing B, as usual. The casing is provided with the ear or mouthpiece C.

Referring now especially to Fig. 1, M is a ring-magnet, the enlarged ends 122 of which are in close proximity. The magnet is securely bolted to the casing, and that pole next the casing and closest to the securing-bolt is provided with a helix, H, which is connected up in the line,as usual. A ring-magnet is shown; but any other shape giving the required conditions may be used. A lug on the armature- 0 pole of the magnet carries a screw-threaded arm, D, which rests against the diaphragm. This armmay be adjusted to bring the parts to any desired tension. If a person speaks into the mouth piece, the diaphragm will be 5 vibrated, and by means of the arm D will cause the pole of the magnet by which it is carried to follow its vibration, thus inducing variations of current in the helix and line-wire, as is well understood. When used as a receiver the vari- 0 ations of current in the helix H cause corresponding vibrations of the opposite pole of the magnet, which, through the arm D, will cause a corresponding vibration of the diaphragm and the reproduction of the message transmitted. The pole of the magnet which 5 carries the arm D acts in areflex manner upon the pole carrying the helix, so that inoperation both poles of the magnet will vibrate.

In Fig. 2 the magnet is supported upon a bracket, E, projecting from the casing. In 0 this instrument the position of the magnet is reversed, its pole which carries the arm D being next to the casing of theinstrument. 'The threaded arm D in thisinstancc passes through an aperture in the center of the diaphragm,

and has an adjusting-nut on its end. The operation is the same as that of the instrument shown in Fig. 1. In Fig. 2 two helices, H H, are shown on the magnet. Each may be placed in a different circuit, as is well understood. 6o

ma net havin its )oles arran ed in close b b proximity, the arm carried by one pole of the magnet and resting in contact with the diaphragm, and the helix carried by the other pole, substantially as and for the purpose set forth.

2. The combination of the casing, the diaphragm, the ring-magnet secured to the cas- 7o ing, the helix on one pole of the magnet, the opposite pole of the magnet, and the arm carried by the free pole of the magnet in contact with the diaphragm.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

J. HARRIS ROGERS.

Witnesses:

JAMES L. Nonnrs, JAMES A. RUTHERFORD. 

